Imposibilidad de situar cabezal en punto cero. (Inability to position the head at zero point)

[JaumeCat (Jaume)]

Buenos días, tengo un par de problemas que no se cómo solucionar. intentaré explicarme con claridad.

Estoy probando y usando Lightburn versión 2.0.00-RC-6 y me está dando problemas, no se si he hecho algo mal o es cuestión de la versión.

Ayer funcionaba bien e hice un trabajo sin problemas. Pero hoy hace el tonto y no veo cómo solucionar el problema.

Dibujo un cuadrado en la zona donde quiero que haga el corte, empezando en el punto X0, Y0. Pero no hay manera que el programa coloque el cabezal donde debe ir, en el ángulo inferior izquierda. Si lo coloco físicamente en este ángulo, y clico sobre la casita (retornar X/Y a 0), el cabezal empieza a rebotar y se cargará algun motor. La configuración es esta:

Good morning, I have a couple of problems that I don’t know how to solve. I’ll try to explain myself clearly.

I’m testing and using Lightburn version 2.0.00-RC-6, and it’s giving me problems. I don’t know if I did something wrong or if it’s a version issue.

Yesterday it worked fine, and I did a job without any problems. But today it’s acting up, and I don’t see how to solve the problem.

I draw a square in the area where I want the cut to be, starting at the X0, Y0 point. But there’s no way the program will place the head where it should be, in the lower left corner. If I physically place it at this angle and click on the little house (return X/Y to 0), the head will start to bounce and some motor will load. The configuration is as follows:

La cosa es que no hay manera o no se reconfigurar la puesta a punto para que el cabezal se coloque a X0/Y0.

Otro fallo es que colocando el cabezal fuera del ángulo inferior izquierdo y activando “Marco”, sigue el corte correctament: parte de A inicio, desde la posición que lo he colocado a mano, corta 1, 2, 3, 4 y cuando termina, se va a la posición B final, y no retorna a la posición que debería, a posición inicial de A inicio.

The problem is that there’s no way, or I don’t know how, to reconfigure the setup so that the head is positioned at X0/Y0.

Another flaw is that when I place the head outside the lower left corner and activate “Frame,” it continues the cut correctly: it starts from start A, from the position I manually positioned it, cuts 1, 2, 3, 4, and when it finishes, it goes to the final position B, and doesn’t return to the position it should, the initial position of start A.

Alguien sabe de estos problemas? Es cosa de mi láser o puede ser de la versión? En principio, la versión LightBurn 1.7.08, parece que funciona correctamente y no tiene estos problemas.

Alguien podría pasarme algun enlace de algun tutorial que explique con claridad cómo configurar la puesta a cero?

gracias por la atención y la ayuda.

Salu2 cordiales.

Does anyone know about these issues? Is it a problem with my laser, or could it be a problem with the version? Initially, LightBurn version 1.7.08 seems to work correctly and doesn’t have these issues.

Could someone send me a link to a tutorial that clearly explains how to configure the zeroing?

Thanks for your attention and help.

Best regards.

[MikeyH (Mike Hembrey)]

Issue #1 = It sounds like a limit switch has become loose or is defective. You cannot reconfigure the Home cycle operation. Home position is at a fixed location determined by the laser manufacturer. The Home cycle must be working and completed before doing anything else.

Issue #2 = The finish position can be controlled my using the Set Finish Position button in the Move window. Put the laser where you want it to finish and click the button.

NOTE: Use Absolute Coords only. The laser will go where the drawing is located in Lightburn. This makes it much easier to use the laser.

[JaumeCat (Jaume)]

Gracias por la atención y la ayuda, MikeyH.

1.- Mi máquina no dispone de interruptores de fin de carrera. No entiendo lo del “ciclo de inicio”. Donde está? A qué se refiere? Insisto en que en la versión anterior V1.7.08, funciona correctamente.

El display de la máquina me indica “The current position (…) is outside the workspace. Are you sure?”. Supongo que esto debe configurarse desde Lightburn. Pero no se cómo ni donde.

Te adjunto el listado que me da desde “Move”, por si te da alguna pista:

Thanks for your attention and help, MikeyH.

1. My machine doesn’t have limit switches. I don’t understand the “home cycle” thing. Where is it? What does it refer to? I insist that in the previous version V1.7.08, it works correctly.

The machine’s display tells me “The current position (…) is outside the workspace. Are you sure?” I assume this must be configured from Lightburn. But I don’t know how or where.

I’m attaching the list it gives me from “Move,” in case it gives you any clues:

2.- Entiendo este punto. Haciendo lo que dices, ya no retorna, si no que acaba en el punto donde empezó. Pero me acabo de dar cuenta que, poniendo el cabezal en el centro de la zona de corte, ahora el recorrido que hace es al revés: empieza en el ángulo superior izquierdo, y termina en el mismo punto, cuando debería empezar en el ángulo inferior izquierdo y acabar en el mismo punto. Por este motivo, si lo coloco en el ángulo inferior izquierdo, cuando arranca repiquetea, porqué intenta bajar en lugar de subir y los límites del marco de la máquina se lo impide.

2. I understand this point. By doing what you’re saying, it no longer returns, but instead ends at the point where it started. But I just realized that, by placing the head in the center of the cutting area, the path it now follows is the opposite: it starts in the upper left corner and ends at the same point, when it should start in the lower left corner and end at the same point. For this reason, if I place it in the lower left corner, it rattles when it starts, because it tries to go down instead of up, and the machine’s frame limits it.

No hay ningun tutorial, en español, sobre la manera de configurar el punto cero?

Is there any tutorial, in Spanish, on how to configure the zero point?

[JaumeCat (Jaume)]

En “Vista previa”, el punto está donde debe estar, y el recorrido es el que debe hacer:

In “Preview,” the point is where it should be, and the path is what it should take:

[MikeyH (Mike Hembrey)]

@JaumeCat

1.- Mi máquina no dispone de interruptores de fin de carrera. No entiendo lo del “ciclo de inicio”. Donde está? A qué se refiere? Insisto en que en la versión anterior V1.7.08, funciona correctamente.

Not possible. For the Home cycle to work, it MUST have limit switches. Without switches, your Origin is wherever the laser is sitting when you power it up. You must then use the Set Origin button if you want to change it.

@JaumeCat

El display de la máquina me indica “The current position (…) is outside the workspace. Are you sure?”. Supongo que esto debe configurarse desde Lightburn. Pero no se cómo ni donde.

If you do not have Absolute Coords selected, this is a possible message.

@JaumeCat

Por este motivo, si lo coloco en el ángulo inferior izquierdo, cuando arranca repiquetea, porqué intenta bajar en lugar de subir y los límites del marco de la máquina se lo impide.

This implies your machine GRBL parameters are not set up properly. Or you have the wrong selection in the Device Settings window.

@JaumeCat

No hay ningun tutorial, en español, sobre la manera de configurar el punto cero?

I have no idea. I do not speak Spanish, German, Chinese, and speak English poorly. I am sure you can run the Lightburn document web pages through Google Translate and get some understanding of the material. That is how I do it.

This may help,

GRBL Configuration - LightBurn Documentation

[JaumeCat (Jaume)]

Mira, gracias por el intento de ayuda, pero esto no hay manera de que funcione. Voy a eliminar las nuevas versiones 2.0.00 de prueba y voy a seguir con la V1.7.08. Entre otros problemas, además de lo comentado, cada vez tengo que seleccionar mi máquina, a que parece que no la reconoce o que se yo.

Ya instaré la nueva versión cuando sea la corregida y definitiva.

Gracias por la ayuda MikeyH y por el tiempo que te has tomado.

Saludos cordiales.

Look, thanks for trying to help, but this just won’t work. I’m going to delete the new 2.0.00 trial versions and continue with V1.7.08. Among other problems, in addition to what I mentioned, I have to select my machine every time, because it doesn’t seem to recognize it or something.

I’ll install the new version when it’s fixed and final.

Thanks for the help, MikeyH, and for taking the time.

Best regards.

[MikeyH (Mike Hembrey)]

If v1.7.08 does not cure the problem, then it is not the software.

If it does cure the problem, send an email to support@lightburnsoftware.com and include the link to this thread.

[JaumeCat (Jaume)]

Sí, la v1.7.08 funciona muy bien y no presenta ninguno de estos problemas. Voy a enviar el enlace donde indicas.

Gracias de nuevo.

Saludos cordiales.

Yes, version 1.7.08 works very well and doesn’t have any of these issues. I’ll send the link where you indicated.

Thanks again.

Best regards.

[JohnJohn (John Johnson)]

@JaumeCat

Sí, la v1.7.08 funciona muy bien y no presenta ninguno de estos problemas. Voy a enviar el enlace donde indicas.

If LightBurn v1.7.08 is working without any problems, please export the “Bundle” of settings from 1.7.08 and import them into V.2.0 when it is convenient for you to do so.

User Bundles - LightBurn Documentation

One of the features of the GCode laser engravers that is often confusing is that Homing, the automatic process that finds 0,0 when the laser is switched on, is internal to the controller and not handled by LightBurn.

When LightBurn issues a $H command, the automated homing in the GCode laser engraver is triggered. This is all set up when the engraver is manufactured so it’s almost always correct.

The workspace settings or work area settings where the laser operates, under the control of LightBurn, could be set incorrectly.

If your square is engraved in the wrong sequence, and if the laser module is striking the frame of the engraver a few things are known.

The limit switch (or limit sensing), whether it is present or not, is not stopping the laser engraver from colliding with the frame of the machine.

The motion planner in the control board of the laser engraver does not know the position of the laser or the directions of the axes, or the size of the work area.

The most common way to unintentionally reverse the directions of either axis is to select the Origin in Device settings in LightBurn in a way that mismatches what the laser engraver needs.

The next step is to confirm that LightBurn and the GCode laser engraver agree on the directions of the axes. This can be done in LightBurn by using the Jog commands in the Move window (in LightBurn)

In the Move window, set the jog speeds to 300 mm/minute and the distance settings to 10mm.

Then proceed to test the behavior of the Jog arrows around the house (in the Move window).

• Please confirm that the Jog arrows cause the laser module to move in the direction that the arrow is pointing.

If a pair of opposing Jog arrows shows behavior that is reversed, we can change the location of the Origin in Device settings. If this behaves correctly, we can move to the next step.

@MikeyH

Not possible. For the Home cycle to work, it MUST have limit switches. Without switches, your Origin is wherever the laser is sitting when you power it up. You must then use the Set Origin button if you want to change it.

This is true almost all the time. Some more advanced GCode laser engravers have stepper motor controllers that find the limit by sensing the current load of the stepper motor when it stalls at the limit of the chassis. Further confusion is added when the engraver is assembled in a way that occasionally jams or binds up before reaching the Origin. This results in the Origin being set arbitrarily wherever the gantry got stuck adding a whole new layer to the troubleshooting process.

[MikeyH (Mike Hembrey)]

@JohnJohn

This is true almost all the time

I know about those and hate them. How about we slam into the frame and call that ZERO?

I confess there are exceptions to everything I say, my world is not perfect.

I am just glad I discovered a bunch of people that I can learn from.

[JohnJohn (John Johnson)]

The only thing I like about the current sensing drivers is that they require zero pull-off (theoretically..)

It’s hard to explain switch pull-off and why people can’t home their lasers to the rail when they have limit switches.

If you can activate the switch (or proximity sensor) in the work area, deactivating the switch in the work area will require a small amount of travel away from the switch.

Pulling back from the switch to arrive at the rail would require an additional moving part or a violation of the laws of physics.

[MikeyH (Mike Hembrey)]

@JohnJohn

hard to explain switch pull-off

It is called hysteresis. Unless they play with one, yes hard to explain.

Being an electronics guy, it is hard for me to accept motor temperature will not impact the cutoff current. I wonder if the big machines use this method instead of mechanical switches.